I thought this was pretty cool: a credit card magstripe "emulator" that can simulate a credit card swipe.
http://www.theregister.co.uk/2015/11/25/kamkar_credit_card/
http://samy.pl/magspoof/
I was most interested in how he visually shows the magnetic stripe on the card with little iron oxide particles.
It was interesting that he was using a "coin" card in his video.
https://onlycoin.com/
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